Styrene polymer composition

ABSTRACT

Disclosed is a styrene polymer composition comprising, in a specified proportion, 
     (A) a styrene polymer having no functional group, and 
     (B) either of polyphenylene ether having a polar group or a mixture of polyphenylene ether having a polar group and a styrene polymer having no functional group; or a styrene polymer composition comprising 
     (C) polyamide, as well as above Components (A) and (B). 
     These polymer compositions are excellent in impact resistance, water resistance, and mechanical properties, and are suitable for various purposes.

This is a division of application Ser. No. 07/581,115, filed Sep. 12, 1990.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a styrene polymer composition. More particularly, it is concerned with a styrene polymer composition which is suitable to be molded into industrial materials such as electric and electronic materials (e.g., connector, and printed substrates), construction materials for industrial use, parts of automobiles (e.g., connectors for the use in vehicles, wheel caps, cylinder head cover, etc.), parts of home electric appliances, and various machines.

2. Description of the Related Arts

Heretofore, synthetic resins have been improved in their mechanical properties, particularly, rigidity and heat resistance, by compounding inorganic fillers including glass fiber with them. Styrene polymers, however, have not a sufficient adhesivity to inorganic fillers so that additives to improve their adhesivity and surface-treating agents of inorganic fillers have been studies. As the result, various surface-treating agents which contain various kinds of aminosilane compounds with polyester type resins, or vinyl acetate type resins, and also additives such as maleic anhydride/styrene copolymers and the like have been developed. Specifically, surface-treating agents such as silane-based coupling agents for glass fibers and the like, and a composition containing an additive, such as a styrene/maleic anhydride-styrene/glass fiber composition (Japanese Patent Application Laid-Open No. 161836/1980, Japanese Patent Application Laid-Open No. 19097/1970) have been known. However, these had not sufficiently improved effects yet.

Japanese patent Application Laid-Open No. 257948/1987 and other proposed resin compositions which were excellent in heat resistance and mechanical properties, and which were obtained by adding an inorganic filler to a styrene polymer having a syndiotactic configuration, or adding a thermoplastic resin and/or a rubber and an inorganic filler to a styrene polymer having a syndiotactic configuration. Also in these compositions, however, the adhesivity between the styrene polymer having a syndiotactic configuration and the inorganic filler was insufficient, and had room for improvement.

To be more specifically, when the conventional inorganic fillers surface-treated with various surface-treating agents, and additives were added to the styrene polymer, the adhesivity with styrene polymer, especially a polystyrene having a syndiotactic configuration was insufficient, and the resulting compositions were poor in impact resistance, and none of them had a Izod impact strength (notched) of more than 6.0 kg cm/cm. Accordingly, a styrene polymer composition having an improved impact resistance has been desired.

On the other hand, polyamides have been used as the material to be molded into various products such as domestic products, electric products and parts of machines or devices, since they are excellent in moldability and heat-resistance, and have a sufficient rigidity.

In spite of these excellent properties, however, polyamide has a disadvantage in that it is far from being sufficient in water resistance.

The group of the present inventor has attempted to remove the above disadvantage by blending, with polyamide, a styrene polymer having a high degree of syndiotacticity, but the effect of improving the properties by blending met a limitation, for the composition of such resins as polyamide and polystyrene that are substantially incompatible with each other could not avoid a fall in mechanical properties due to the insufficient strength of the interface between the phases.

Under the circumstances, the present inventor has repeated earnest studies to develop a styrene polymer composition excellent in all of impact resistance, heat resistance, and mechanical strength which has never seen before. Further, the study has proceeded, also in order to develop a composition greatly improved in heat resistance and water resistance, without lowering the mechanical properties of polyamide, by improving the compatibility between a styrene polymer having a syndiotactic configuration and a polyamide resin.

SUMMARY OF THE INVENTION

The present invention provides a styrene polymer composition (Composition I) comprising

(A) 99.9 to 20% by weight of a styrene polymer having no functional group, and

(B) 0.1 to 80% by weight of polyphenylene ether having a polar group or a mixture of polyphenylene ether having a polar group and a styrene polymer having no functional group.

The present invention also provides a styrene polymer composition (Composition II) comprising

(A) 99 to 1% by weight of a styrene polymer having no functional group,

(B) 0.1 to 50% by weight of polyphenylene ether having a polar group or a mixture of polyphenylene ether having a polar group and a styrene polymer having no functional group, and

(C) 0.9 to g8.9% by weight of polyamide.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In Composition I and II of the present invention, the styrene polymer having no functional group, used as Component (A), may be various styrene polymers provided that they have no functional group, and those which have at least 25% by weight of the repeating unit, derived from the vinyl aromatic compound represented by the general formula: ##STR1## (wherein R is a hydrogen or an alkyl group having 1 to 4 carbon atoms, Z is a hydrogen, a halogen atom, or an alkyl group having 1 to 4 carbon atoms, and p is an integer of 1 to 5) can be used.

Examples of such styrene polymers are homopolymer of styrene or its derivatives; styrene polymer modified by natural or synthetic elastomer material such as polybutadiene, polyisoprene, isobutylene-isoprene rubber, EPDM, ethylene-propylene copolymer, natural rubber, epichlorohydrin; further, styrene-containing copolymers including styrene-methylstyrene copolymer, styrene-butadiene copolymer and the like. Among them, particularly preferred are styrene polymers having a syndiotactic configuration, atactic polystyrene, isotactic polystyrene, poly(α-methyl styrene), polybutadiene-modified styrene polymer, butadiene-styrene copolymer, isoprene-styrene copolymer, and high impact resistant polystyrene (HIPS).

Here in the styrene polymer having a syndiotactic configuration, the syndiotactic configuration means that the stereostructure is a syndiotactic configuration, i.e., the stereostructure in which phenyl groups or substituted phenyl groups are located as side chains alternately in opposite directions relative to the main chain consisting of carbon-carbon bonds. The tacticity is quantitatively determined by the nuclear magnetic resonance method using a carbon isotope (¹³ C-NMR) methods. The tacticity as determined by the ¹³ C-NMR method can be indicated in terms of proportions of structural units continuously connected to each other, i.e., a diad in which two structural units are connected to each other, a triad in which three structural units are connected to each other, or pentad in which five structural units are connected to each other. Styrene polymers having the syndiotactic configuration of the present invention include polystyrene, poly(alkylstyrene), poly(halogenated styrene), poly(halogenated alkylstyrene), poly(vinyl benzoate), the hydrogenated polymers thereof and the mixtures thereof, and copolymers containing the above polymers as main components, having such a syndiotacticity that the proportion of racemic diad is at least 75%, preferably at least 85%, or the proportion of racemic pentad is at least 30%, preferably at least 50%. The poly(alkylstyrene) can include poly(methylstyrene), poly(ethylstyrene), poly(isopropylstyrene), poly(tert-butylstyrene), poly(phenylstyrene), poly(vinylnaphthalene), and poly(vinylstyrene), etc; the poly(halogenated styrene) include poly(chlorostyrene) poly(bromostyrene), poly(fluorostyrene), etc.

The most preferred styrene polymers are polystyrene, poly(p-methylstyrene), poly(m-methylstyrene), poly(p-tert-butylstyrene), poly(p-chlorostyrene), poly(m-chlorostyrene), poly(p-fluorostyrene), hydrogenated polystyrene, and a copolymer containing the structure units thereof.

The molecular weight of the styrene polymer used in the present invention is not critical, but is preferably at least 10,000, and more preferably at least 50,000 of a weight average molecular weight. If the weight average molecular weight is less than 10,000, the thermal properties and mechanical properties of the resulting composition or the molding is undesirably lowered.

The styrene polymers having a syndiotactic configuration can be produced by polymerizing styrene monomers (corresponding to the above styrene polymers) using a catalyst comprising a titanium compound and a condensate of water and a trialkylaluminum in, for example, an inert hydrocarbon solvent, or in the absence of a solvent (Japanese Patent Application Laid-Open No. 187708/1987).

As Component (B) in Compositions I and II of the present invention, either of a polyphenylene ether having a polar group or a mixture of a polyphenylene ether having a polar group and a styrene polymer having no functional group, is used. An example of styrene polymer having no functional group is, as well as styrene polymers shown as Component (A) above, a styrene polymer obtained by introducing at least one of the compounds including acrylonitrile, methylmethacrylate, methacrylonitrile and the like to a styrene polymer shown as Component (A). The amount of the styrene polymer to be blended with polyphenylene ether is preferably not more than 80% by weight, and if it is in excess of said amount, the substantial amount of polyphenylene ether to the above-mentioned Component (A) is undesirably lowered.

Polyphenylene ether is known in itself. It is described in the specifications of U.S. Pat. Nos. 3,306,874, 3,306,875, 3,257,357, and 3,257,358. Polyphenylene ether can be prepared usually by oxidization coupling reaction in which homopolymer or copolymer is produced in the presence of a copper amine complex and one or more of phenols substituted at two or three positions. Therein copper amine complexes derived from primary, secondary or tertiary amines can be used.

Examples of preferred polyphenylene ethers are

poly(2,3-dimethyl-6-ethylphenylene-1,4-ether),

poly(2-methyl-6-chloromethyl-1,4-phenylene)ether,

poly(2-methyl-6-hydroxydiethyl-1,4-phenylene)ether,

poly(2-methyl-6-n-butyl-1,4-phenylene)ether,

poly(2-ethyl-6-isopropyl-1,4-phenylene)ether,

poly(2-ethyl-6-n-propyl-1,4-phenylene)ether,

poly(2,3,6-trimethylphenylene-1,4-ether),

poly[2-(4'-methylphenyl)phenylene-1,4-ether],

poly(2-bromo-6-phenylphenylene-1,4-ether),

poly(2-methyl-6-phenylphenylene-1,4-ether),

poly(2-phenylphenylene-1,4-ether),

poly(2-chlorophenylene-1,4-ether),

poly(2-methylphenylene-1,4-ether),

poly(2-chloro-6-ethylphenylene-1,4-ether),

poly(2-chloro-6-bromophenylene-1,4-ether),

poly(2-6-di-n-propylphenylene-1,4-ether),

poly(2-methyl-6-isopropylphenylene-1,4-ether),

poly(2-chloro-6-methylphenylene-1,4-ether),

poly(2-methyl-6-ethylphenylene-1,4-ether),

poly(2,6-dibromophenylene-1,4-ether),

poly(2,6-dichlorophenylene-1,4-ether),

poly(2,6-diethylphenylene-1,4-ether), and

poly(2,6-dimethylphenylene-1,4-ether).

Also copolymers derived from two or more of phenyl compounds as used for the preparation of above-mentioned homopolymer are suitable. Further examples are graft copolymers and block copolymers of vinyl aromatic compounds including polystyrene and the above-mentioned polyphenylene ether.

The polar groups contained in Component (B) include acid halide, a carbonyl group, acid anhydride, acid amide, carboxylate, acid azide, a sulfone group, a nitrile group, a cyano group, an isocyanic acid ester group, an amino group, a hydroxyl group, an imide group, a thiol group, an oxazoline group, and an epoxy group.

Particularly preferable polar group is acid anhydrides, among which maleic anhydride is more preferable. The content of said polar group is preferably not less than 0.01% by weight of above polyphenylene ether, and if it is under 0.01% by weight, mechanical strength of resulting polymer cannot be expected to be improved.

In order to obtain said Component (B), a method to polymerize one or plural kinds of phenol compounds having these polar groups, a method to copolymerize one or plural kinds of phenol compounds having a polar group with phenol compounds having no polar group, and a method to react a compound containing both a polar group and an unsaturated group with polyphenylene ether can be used.

Above-mentioned compounds containing both a polar group and an unsaturated group are those which contain, in a molecular, both of an unsaturated group having carbon-carbon double bond or carbon-carbon triple bond; and a polar group such as carboxylic acid group, a group derived from carboxylic acid (for example, various salts, esters, acid amides, acid anhydrides, imides, acid azides, and acid halides which result from substitution of hydrogen atoms or a hydroxyl group of carboxyl group), or oxazoline, nitrile, epoxy group, amino group, hydroxylic acid or isocyanate.

As the compound containing both of an unsaturated group and a polar group, unsaturated carboxylic acid, unsaturated carboxylic acid derivative, unsaturated epoxy compound, unsaturated alcohol, unsaturated amine, unsaturated isocyanate and the like are mainly used.

Specific examples of these compounds are maleic anhydride, maleic acid, fumaric acid, maleimide, maleic hydrazide, reaction products of maleic anhydride and diamine such as the compounds having the structure represented by: ##STR2## (wherein R is an aliphatic group, or an aromatic group); anhydrous methyl, methyl nadic anhydride, dichloromaleic anhydride, maleic acid amide, itaconic acid, itaconic anhydride, acids of natural fats and oils such as soybean oil, tung oil, castor oil, linseed oil, hempseed oil, cotton seed oil, sesame oil, rapeseed oil, peanut oil, camellia oil, olive oil, coconut oil, and sardine oil; unsaturated carboxylic acids such as acrylic acid, butenoic acid, crotonic acid, vinyl acetic acid, methacrylic acid, pentenoic acid, angelic acid, 2-pentenoic acid, 3-pentenoic acid, α-ethylacrylic acid, β-methylcrotonic acid, 4-pentenoic acid, 2-hexenoic acid, 2-methyl-2-pentenoic acid, 3-methyl-2-pentenoic acid, α-ethylcrotonic acid, 2-2-dimethyl-3-butenoic acid, 2-heptenoic acid, 2-octenoic acid, 4-decenoic acid, 9-undecenoic acid, 10-undecenoic acid, 4-dodecenoic acid, 5-dodecenoic acid, 4-tetradecenoic acid, 9-tetradecenoic acid, 9-hexadecenoic acid, 2-octadecenoic acid, 9-octadecenoic acid, eicosenoic acid, dococenoic acid, erucic acid, tetracosenoic acid, 2,4-pentadienoic acid, 2,4-hexadienoic acid, diallyl acetate, geraniumic acid, 2,4-decadienoic acid, 2,4-dodecadienoic acid, 9,12-hexadecadienoic acid, 9,12-octadecadienoic acid, hexadecatrienoic acid, linolic acid, linolenic acid, octadecatrienoic acid, eicosadienoic acid, eicosatrienoic acid, eicosatetraenoic acid, ricinolic acid, eleostearic acid, oleic acid, eicosapentaenoic acid, docosadienoic acid, docosatrienoic acid, docosatetraehoic acid, docosapentaenoic acid, tetracosenoic acid, hexacosenoic acid, hexacodienoic acid, octacosenoic acid, and esters, acid amides and anhydrides of these unsaturated carboxylic acids; unsaturated alcohols such as allyl alcohol, methylvinyl carbinol, allyl carbinol, methylpropenyl carbinol, 4-pentene-1-ol, 10-undecane-1-ol, propargyl alcohol, 1,4-pentadiene-3-ol, 1,4-hexadiene-3-ol, 3,5-hexadiene-2-ol, 2,4-hexadiene-1-ol, alcohols represented by the general formulas: C_(n) H_(2n-5) OH, C_(n) H_(2n-7) OH, C_(n) H_(2n-9) OH (n is a positive integer), 3-butene-1,2-diol, 2,5-dimethyl-3-hexene-2,5-diol, 1,5-hexadiene-3,4-diol, and 2,6-octadiene-4,5-diol, and unsaturated amines which result from substitution of NH₂ for OH group of these unsaturated alcohols; those result from addition of maleic anhydride or phenols to low polymers (e.g., polymers having an average molecular weight of 500 to 10000) or high-molecular polymers (e.g., those having an average molecular weight of 10000 or more) of butadiene or isoprene; those compounds to which amino group carboxyl group, hydroxyl group, or expoxy group is introduced; and allyl isocyanate.

Examples of the vinyl compounds having epoxy group are glycidyl methacrylate, glycidyl acrylate, vinyl glycidyl ether, glycidyl ether of hydroxyalkyl(meth)acrylate, glycidyl ether of polyalkyleneglycol(meth)acrylate, and glycidylitaconate, among which glycidyl methacrylate is particularly preferred.

The compound having both of an unsaturated group and a polar group in the present invention also include, needless to say, compounds having two or more of unsaturated groups and two or more of polar groups (the same or different), and two or more of compounds having such groups.

Specified methods for preparing Component (B) include a method to melt and knead a polyphenylene ether and a compound having both a polar group and an unsaturated group at a temperature of 150° C. to 350° C. by the use of a roller mill, Banbury mixer, an extruder or the like, to react them, and a method to heat and react a polyphenylene ether and a compound having both a polar group and an unsaturated group in the solvent such as benzene, toluene, xylene and the like. Further, in order to proceed with these reactions, it is effective to use a radical initiator, in the reaction system, such as organic peroxides including benzoyl peroxide, di-t-butyl-peroxide, dicumylperoxide, and t-butylperoxibenzoate, or azo compounds including azobisisobutylonitrile, azobisisobaleronitrile and the like.

A method to melt and knead a polyphenylene ether and a compound having both a polar group and an unsaturated group in the presence of radical initiator is more effective.

Component (B) can be produced also by melting and kneading the above-mentioned styrene polymer as a part of Component (B), a polyphenylene ether and a compound having both a polar group and an unsaturated group, in the presence of a radical initiator.

In Composition I of the present invention, the amount of Component (B) is 0.1 to 80% by weight, preferably 0.5 to 50% by weight, particularly preferably 1 to 25% by weight, of the total amount of Component (A) and Component (B). Particularly when styrene polymer having a syndiotactic configuration is used as Component (A), the amount of Component (B) is 0.1 to 50% by weight, preferably 0.5 to 30% by weight, and most preferably 1 to 25% by weight. Polyphenylene ether as Component (B) or as a part of Component (B) has a high compatibility with styrene polymer as Component (A), but if the amount of it is under 0.1% by weight, the resulting composition cannot be improved in mechanical strength.

On the other hand, if it is added in excess of 80% by weight, the final composition becomes very near to Component (B) itself, which is poor in moldability. When a styrene polymer having a syndiotactic configuration is used, a very high compatibility with polyphenylene ether is obtained, but if it is added in excess of 50% by weight, heat resistance and moldability of the resulting composition are sometimes lowered.

In Composition II of the present invention, the amount of Component (A) to be blended is 1 to 99% by weight, preferably 10 to 95% by weight, and more preferably 20 to 95% by weight. Herein if the amount of Component (A) is under 1% by weight, the resulting Composition II cannot be improved in water resistance, while if it is in excess of 99% by weight, the mechanical strength of said composition becomes almost the same as that of the styrene polymer as Component (A).

In Composition II of the present invention, the amount of Component (B) is 0.1 to 50% by weight, preferably 0.5 to 40% by weight, and more preferably 1 to 30% by weight. Particularly, when a styrene polymer having a syndiotactic configuration is used as Component (A), said amount is preferably 0.5 to 30% by weight, and most preferably 1 to 25% by weight. Said polyphenylene ether as Component (B) or a part of it has a high compatibility with a styrene polymer as Component (A), but if its content is under 0.1% by weight, strength. If it is added in an amount of above 50% by weight, the resulting composition becomes lowered in heat resistance and moldability.

To produce Compositions I and II of the present invention, it is not necessary to prepare in advance said Component (B), but these compositions can be produced by mixing styrene polymer as Component (A) and a part of Component (B), a polyphenylene ether to be Component (B), a compound having both a polar group and an unsaturated group, and additives such as fillers, and subsequently by melting and kneading the mixture thereof at 150° to 350° C. with the use of a roller mill, a Banbury mixer, an extruder and the like.

Composition I of the present invention basically comprises above Component (A) and Component (B).

On the other hand, in Composition II of the present invention, polyamide is blended further as Component (C). As said polyamide as Component (C), all the conventional thermoplastic polyamide can be used. Examples of preferred polyamides are polyamide-4; polyamide-6; polyamide-4,6; polyamide-6,6; polyamide-3,4; polyamide-12; polyamide-11, polyamide-6,10; polyamide purified from terephthalic acid and 4,4'-diaminocyclohexylmethane; polyamide purified from azelaic acid, adipic acid and 2,2-bis(p-aminocyclohexyl)propane; polyamide purified from adipic acid and methaxylylene diamine; and polyamide purified from terephthalic acid and trimethylhexamethylene diamine.

Aromatic polyamide resin (hereinafter referred to as PA) is a polyamide containing an amide bond having an aromatic nucleus, as a repeating unit, in its main chain. More specifically, the aromatic polyamide resin used in the present invention is appropriately selected from the polymers which are obtained by reacting, according to the conventional method, ω'-carboxylic compound having aromatic group with the polymer obtained by reacting an aromatic diamine component and a dicarboxylic acid component.

As the aromatic diamine components, diamine compounds having benzene ring, of which typical examples are 1,4-diaminobenzene; 1,3-diaminobenzene; 1,2-diaminobenzene; 2,4-diaminotoluene; 2,3-diaminotoluene; 2,5-diaminotoluene; 2,6-diaminotoluene; ortho-, meta-, and para-xylilene diamine; ortho-, meta-, and para-2,2'-diaminodiethyl benzene; 4,4'-diaminobiphenyl; 4,4'-diaminodiphenyl methane; 4,4'-diaminodiphenyl ether; 4,4'-diaminodiphenyl thioether; 4,4'-diaminodiphenyl ketone; and 4,4'-diaminodiphenyl sulfone, are used. The aromatic diamine component may be solely the diamine compound having the above benzene ring, or may be a mixture with other diamine compounds such as aliphatic diamines, as long as said diamine compound is contained in the amount of at least 50 mol %. Of course, two or more kinds of diamine compounds having benzene ring may be used in combination.

Next, examples of dicarboxylic acid components are aliphatic dicarboxylic compounds such as glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid; aromatic dicarboxylic compounds such as phthalic acid, isophthalic acid, terephthalic acid, naphthalene dicarboxylic acid and the like; and further, acid chlorides of these dicarboxylic compounds. These compounds can be used in combination.

Further, examples of ω-amino-ω'-carboxylic compounds having aromatic nucleus are 4-aminophenylcarboxyl methane, 1-(4-aminophenyl)-2-carboxyl ethane, 3-(4-aminophenyl)-1-carboxyl propane, para-(3-amino-3'-hydroxy)dipropyl benzene and the like. Preferred aromatic polyamide resins used in the present invention are polyamides derived from diamine compound having benzene ring and aliphatic dicarboxylic acid, and a more preferable example is a polyamide derived from xylylene diamine and adipic acid.

The most preferable example is a polyamide derived from meta-xylylene diamine and adipic acid.

The amount of said Component (C) blended is 0.9 to 98.9% by weight, preferably 5 to 90% by weight, more preferably 5 to 65% by weight. If the amount of it is under 0.9% by weight, no improvement in mechanical strength results. If it is in excess of 98.9% by weight, the water resistance of the resulting composition becomes very near to that of polyamide.

Composition II of the present invention comprises basically above Components (A), (B) and (C).

In Compositions I and II of the present invention, if necessary, a filler which is surface-treated with a coupling agent can be blended as Component (D). The filler used in the present invention may be in fibrous form, or in the form of granule or powder. Fillers in fibrous forms include glass fiber, carbon fiber, organic synthetic fiber, whisker, ceramic fiber, metal fiber, natural vegetable fiber and the like.

Examples of specified organic synthetic fibers are those including all aromatic polyamide fibers, and polyimide fibers; whiskers of boron, alumina, silica, and silicon carbide; ceramic fibers of gypsum, potassium titanate, magnesium sulfate, and magnesium oxide; metal fibers of copper, aluminum, and steel; and particularly preferred are glass fibers and carbon fibers. The shape of fillers vary in cloth, mat, bundling cut form, short fiber, filament-form, and whisker. In bundling cut form, the length is preferably 0.05 to 50 mm, and the fiber diameter is preferably 5 to 20 μm. As carbon fiber, fibers of polyacrylonitrile (PAN) are preferred.

On the other hand, the particle or powder fillers include talc, carbon black, graphite, titanium dioxide, silica, mica, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, oxysulfate, tin oxide, alumina, kaolin, silicon carbide, metal powder, glass powder, glass flake, glass beads and the like. Talc, calcium carbonate, and mica are particularly preferred. A preferred average particle diameter of talc is 0.3 to 20 μm, more preferably 0.6 to 10 μm. A preferred average particle diameter of calcium carbonate is 0.1 to 20 μm, and preferred average particle diameter of mica is 40 to 250 μm, and more preferably 50 to 150 μm.

In the various fillers as above, particularly preferred are glass fillers such as glass powder, glass flake, glass beads, glass filament, glass fiber, glass roving, and glass mat. The coupling agent used for the surface treatment of above fillers is used for improving the adhesiveness between the filler and polyphenylene ether having a polar group, as Component (B). Therein any one of silane coupling agents and titanium coupling agents, which are conventionally known as coupling agents can be used.

Preferred examples of the silane coupling agents are specifically, triethoxysilane, vinyltris(β-methoxyethoxy)silane, γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β-(1,1-epoxycyclohexyl)ethyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyl-tris(2-methoxy-ethoxy)silane, N-methyl-γ-aminopropyltrimethoxysilane, N-vinylbenzyl-γ-aminopropyltriethoxysilane, triaminopropyltrimethoxysilane, 3-ureidopropyltrimethoxysilane, 3-(4,5-dihydroimidazole)propyltriethoxysilane, hexamethyldisilazane, N,O-(bistrimethylsilyl)amide, N,N-bis(trimethylsilyl)urea and the like. Among them, preferred are aminosilanes and epoxysilanes such as γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane. Particularly preferred are aminosilanes as described above.

Preferred examples of titanium coupling agents are specifically, isopropyltriisostearoyl titanate, isopropyltridodecylbenzenesulfonyl titanate, isopropyltris(dioctylpyrophosphate)titanate, tetraisopropylbis(dioctylphosphate) titanate, tetraoctylbis(ditridecylphosphite) titanate, tetra(1,1-diallyloxymethyl-1-butyl)bis(ditridecyl)phosphite titanate, bis(dioctylpyrophosphate)oxyacetate titanate, bis(dioctylpyrophosphate)ethylene titanate, isopropyltrioctanoyl titanate, isopropyldimethacrylisostearoyl titanate, isopropylisostearoyldiacryl titanate, isopropyltri(dioctylphosphate)titanate, isopropyltricumylphenyl titanate, isopropyltri(N-amideethyl, aminoethyl) titanate, dicumylphenyloxyacetate titanate, and diisostearoylethylene titanate. Among them, preferred is isopropyltri(N-amideethyl, aminoethyl)titanate.

Surface treatment using these coupling agents can be carried out according to the conventional methods, without a particular limitation. More specifically, a sizing treatment in which the organic solvent solution or suspending solution of a coupling agent is applied as a sizing agent on the filler, drying and mixing with the use of Henschel mixer, a super mixer, or V-shape blender; the spray method, the integral blend method, or the dry concentrate method can be used appropriately depending on the form of fillers. Preferred are the sizing treatment, the dry mixing and the spray method.

With the above coupling agent, film-forming materials for glass can be used in combination. Said film-forming materials are not critical but include polyesters, urethane polymers, epoxy polymers, acryl polymers, isocyanate polymers, and vinyl acetate polymers.

In the present invention, the above surface-treated filler component can be blended. The proportion to be blended varies depending on the purposes and objects. In composition I, the surface-treated filler is blended in the proportion of 1 to 350 parts by weight, preferably 5 to 200 parts by weight based on 100 parts by weight of the above components (A) and (B). in composition II, the surface-treated filler is blended in the proportion of 1 to 350 parts by weight, preferably 5 to 200 parts by weight based on 100 parts by weight of the above components (A), (B) and (C).

If the proportion of the surface-treated filler to be blended is less than 1 part by weight, the sufficient effect of the blended filler cannot be obtained. On the other hand, if it exceeds 350 parts by weight, there occur defects that the dispersibility is poor and molding becomes difficult.

Further, in the present invention, by blending (A') a styrene polymer having a syndiotactic configuration as the above component (A), (B') either polyphenylene ether or a mixture of polyphenylene ether and a styrene polymer without any functional groups, having a maleic anhydride group, that is polyphenylene ether modified by maleic anhydride, as the component (B), and (D') a filler surface-treated by an amino silane coupling agent as the component (D) respectively, as described above, the adhesiveness between a styrene polymer and a filler can be improved and a resin composition having more excellent properties can be obtained.

The resin composition of the present invention comprises each component described above, but if necessary, various additives, other thermoplastic resins or rubber-like elastomers can be blended, so long as the object of the present invention is not hindered. Examples of the above additives are an antioxidant such as phosphite and phosphate described in Japanese Patent Application Laid-Open No. 284244/1988, an UV absorbent, an aliphatic carboxylate- or paraffin-based external lubricant as described in Japanese Patent Application Laid-Open Nos. 201350/1989 and 22587/1989, a nuclear agent such as an organic acid metal salt and an organic phosphorus compound, a releasing agent, an antistatic agent, a colorant, a flame retardant and a flame retardant aid.

The above thermoplastic resins include polyphenylene ether without any polar groups, polyolefin such as polyethylene, polypropylene, polybutene and polypentene, polyester such as polyethylene terephthalate, polybutylene terepthalate and polyethylene naphthalate, polythioether such as polyamide and polyphenylene sulfide, polycarbonate, polyarylate, polysulfone, polyether ether ketone, polyether sulfone, polyimide, polyamide imide, polymethyl methacrylate, an ethylene-acrylic acid copolymer, an acrylonitrile-styrene copolymer, an acrylonitrile-chlorinated polyethylene-styrene copolymer, an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer, acrylonitrile-butadiene-styrene copolymer, a vinyl chloride resin, chlorinated polyethylene, fluorinated polyethylene, polyacetal, a thermoplastic polyurethane elastomer, 1,2-polybutadiene and styrene-maleic anhydride. The preferable thermoplastic resin is the one having affinity or reactivity with a polar group of polyphenylene ether having a polar group as Component (B). Examples are polyolefin such as polyethylene, polypropylene, polybutene and polypentene; polyphenylene sulfide; polyester such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polycarbonate, polyarylate, polysulfone, polyether ether ketone, polyether sulfone, polyimide, polymethyl methacrylate, an ethylene-acrylate copolymer, an acrylonitrile-styrene copolymer, an acrylonitrile-chlorinated polyethylene-styrene copolymer, an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer, an acrylonitrile-butadiene-styrene copolymer, polyacetal and a styrene-maleic anhydride copolymer, to which the compound having both a polar group and an unsaturated group, which is used for introduction of a polar group to polyphenylene ether having a polar group as Component (B), is introduced by melting reaction, solution reaction or polymerization. The most preferable thermoplastic resins include maleic anhydride-modified polyethylene, polypropylene, a styrene-maleic anhydride copolymer, polyarylate, polycarbonate, polyphenylene sulfide containing an epoxyl group and polyphenylene sulfide containing an amino group.

Various rubber-like elastomers can be used, and the most preferable one is a rubber-like copolymer containing a styrene-based compound as one component. Examples are styrene-butadiene copolymer rubber (SBR), a styrene-butadiene block copolymer (SB, SBS, BSB, etc.), a styrene-hydrogenated butadiene block copolymer (SEBS, SEB, etc.), a styrene-isoprene block copolymer (SI, SIS, ISI, etc.), a styrene-hydrogenated isoprene block copolymer (SEP, SEPS, etc.), or as described in Japanese Patent Application Laid-Open No. 292049/1989, a granular elastomer obtained by polymerizing a vinyl monomer in the presence of the polymer obtained by polymerizing one or at least two monomers selected from the group consisting of alkyl acrylate, alkyl methacrylate and a multi-functional monomer having a conjugated diene type double bond. Examples of the granular elastomer acrylonitrile-styrene grafted butadiene rubber (ABS), acrylonitrile-styrene grafted butadiene-butyl acrylate copolymer rubber (AABS), methyl methacrylate-styrene grafted butylacrylate rubber (MAS), styrene grafted butadiene rubber (SB), methyl methacrylate-styrene grafted butadiene rubber (MBS) and methyl methacrylate-styrene grafted butadiene-butyl acrylate copolymer rubber (MABS).

Further, examples are one or at least two block or graft copolymers selected from an A-B type block copolymer, an A-grafted B copolymer and a B-grafted A copolymer, wherein A is at least one styrene polymers or styrene copolymers selected from atactic polystyrene, acrylonitrile-styrene random copolymer, styrene-maleic anhydride random copolymer, styrene-acrylonitrile-anhydrous maleimide random copolymer, styrene-methyl methacrylate random copolymer and styrene-methacrylic acid random copolymer, and B is at least one polymers selected from polybutadiene, polyisoprene, hydrogenated polybutadiene, hydrogenated polyisoprene and polycarbonate, and at least one polymers selected from polyamide, polymethyl methacrylate, polyethylene terephthalate and polybutylene terephthalate.

Further, the rubber-like elastomers include, in addition to the above, natural rubber, polybutadiene, polyisoprene, polyisobutyrene, neoprene, ethylene-propylene copolymer rubber, polysulfide rubber, thiokol rubber, acrylic rubber, urethane rubber, silicone rubber and epichlorohydrin rubber.

The rubber-like elastomer modified by reacting with the compound having a polar group and an unsaturated group used for introduction of the polar group to polyphenylene ether having a polar group, may be used.

Among various flame retardants, particularly halogen-based flame retardants and phosphorus-based flame retardants are preferable. The halogen-based flame retardants include, for example, tetrabromobisphenol A, tetrabromophthalic anhydride, hexabromobenzene, tribromophenylallyl ether, pentabromotoluene, pentabromophenol, tribromophenyl-2,3-dibromopropyl ether, tris(2,3-dibromopropyl)phosphate, tris(2-chloro-3-bromopropyl)phosphate, octabromodiphenyl ether, decabromodiphenyl ether, octabromobiphenyl, pentachloropentacyclodecane, hexabromocyclododecane, hexachlorobenzene, pentachlorotoluene, hexabromobiphenyl, decabromobiphenyl, decabromobiphenyl oxide, tetrabromobutane, decabromodiphenyl ether, hexabromodiphenyl ether, ethylene-bis-(tetrabromophthalimide), tetrachlorobisphenol A, tetrabromobisphenol A, an oligomer of tetrachlorobisphenol A or tetrabromobisphenol A, a halogenated polycarbonate oligomer such as a brominated polycarbonate oligomer, a halogenated epoxy compound, polychlorostyrene, halogenated polystyrene such as polytribromostyrene, poly(dibromophenylene oxide) and bis(tribromophenoxy)ethane.

The phosphorus-based flame retardants include ammonium phosphate, tricresyl phosphate, triethyl phosphate, acidic phosphate and triphenylphosphene oxide.

Among them, the preferable flame retardants are particularly polytribromostyrene, poly(dibromophenylene oxide), decabromodiphenyl ether, bis(tribromophenoxy)ethane, ethylene-bis-(tetrabromophthalimide), tetrabromobisphenol A and a brominated polycarbonate oligomer.

The above flame retardant is blended in the proportion of 3 to 40 parts by weight, preferably 5 to 35 parts by weight based on 100 parts by weight of the total amount of the above components (A) and (B) in Composition I of the present invention (based on 100 parts by weight of the total amount of the above components (A), (B) and (C) in Composition II). If the proportion of the flame retarder to be blended is less than 3 parts by weight, less effect is obtained. On the other hand, if it exceeds 40 parts by weight, flame retardance is not improved according to the amount added, but rather other mechanical properties are undesirably impaired.

And further, in the present invention, it is preferable to use a flame retardant aid with the above flame retardant. Various flame retardant aids can be used, for example, antimony flame retardant aids such as antimony trioxide, antimony pentaoxide, sodium antimonate, metal antimony, antimony trichloride, antimony pentachloride, antimony trisulfide and antimony pentasulfide. Also, in addition to the above, zinc borate, barium metaborate and zirconium oxide can be used. Among them, particularly antimony trioxide is preferable. Said flame retardant aid is blended in the proportion of 1 to 15 parts by weight, preferably 2 to 10 parts by weight based on 100 parts by weight of the total amount of the above components (A) and (B) in Composition I of the present invention (based on 100 parts by weight of the total amount of the above components (A), (B) and (C) in Composition II). If the proportion of the flame retardant aid to be blended is less than 1 part by weight, the effect as a flame retardant aid is insufficient. On the other hand, if it exceeds 15 parts by weight, the effect as a flame retardant aid is not improved according to the amount added, but rather there exists possibility of impairing other properties undesirably.

Further, in the present invention, to prevent melt dropping, a tetrafluoroethylene polymer can be used. Specific examples of the tetrafluoroethylene polymer are, in addition to the tetrafluoroethylene homopolymer (polytetrafluoroethylene), a copolymer of tetrafluoroethylene and hexafluoropropylene, and further a tetrafluoroethylene copolymer containing a few copolymerizable ethylenically unsaturated monomers. The tetrafluoroethylene polymer containing 65 to 76% by weight, preferably 70 to 76% by weight of fluorine is used. The above tetrafluoroethylene polymer is blended in the proportion of 0.003 to 10 parts by weight, preferably 0.02 to 2 parts by weight based on 100 parts by weight of the total amount of the above components (A) and (B) in Composition I of the present invention (based on 100 parts by weight of the total amount of the above components (A), (B) and (C) in Composition II).

As described above, the styrene polymer composition has excellent impact resistance, water resistance and mechanical property, and is expected to be utilized effectively for various purposes such as industrial materials including electric and electronic materials, industrial structural materials, automobile parts, domestic electric appliances and various machine parts.

The present invention is described in greater detail with reference to the following examples and comparative examples.

REFERENCE EXAMPLE 1

In a 500-milliliter glass reactor in which air had been replaced with argon, 17.8 g (71 mmol) of copper sulfate pentahydrate (CuSO₄ ·5H₂ O), 200 ml of toluene and 24 ml (250 mmol) of trimethylaluminum were placed and reacted at 40° C. for 8 hours And then, from the solution obtained by removing the solid, the toluene was further distilled away under reduced pressure at room temperature to obtain 6.7 g of a contact product. The molecular weight of said product as determined by the freezing point depression method was 610.

PRODUCTION EXAMPLE 1

In a 2-liter reactor, 1 L (L=liter) of purified styrene, 7.5 mmol of the contact product obtained in the above Reference Example 1 as an aluminum atom, 7.5 mmol of triisobutyl aluminum and 0.038 mmol of pentamethylcyclopentadienyl titanium trimethoxide were placed and polymerized at 90° C. for 5 hours. After completion of the reaction, the resulting product was decomposed in a methanol solution of sodium hydroxide to remove the catalyst component, and then the residue was washed with methanol repeatedly and dried to obtain 466 g of a polymer.

The weight average molecular weight of said polymer as determined using 1,2,4-trichlorobenzene as a solvent at 130° C. by the gel permeation chromatography was 290,000. Weight average molecular weight/number average molecular weight was 2.72. The melting point and ¹³ C-NMR measurements confirmed that said polymer was polystyrene having a syndiotactic configuration (SPS).

PRODUCTION EXAMPLE 2

In a 2-liter reactor, 1 L of purified styrene, 5 mmol as aluminum atom of the contact product obtained in the above Reference Example 1, 5 mmol of triisobutyl aluminum and 0.025 mmol of pentamethylcyclopentadienyl titanium trimethoxide were placed and polymerized at 90° C. for 5 hours. After completion of the reaction, the resulting product was decomposed in a methanol solution of sodium hydroxide to remove the catalyst component, and then the residue was washed with methanol repeatedly and dried to obtain 308 g of a polymer.

The weight average molecular weight of said polymer as determined using 1,2,4-trichlorobenzene as a solvent at 130° C. by the gel permeation chromatography was 389,000. Weight average molecular weight/number average molecular weight was 2.64. The melting point and ¹³ C-NMR measurements confirmed that said polymer was polystyrene having a syndiotactic configuration.

PRODUCTION EXAMPLE 3

In a 2-liter reactor, 1 L of purified styrene, 7.5 mmol as aluminum atom of the contact product obtained in the above Reference Example 1, 7.5 mmol of triisobutyl aluminum and 0.038 mmol of pentamethylcyclopentadienyl titanium trimethoxide were placed and polymerized at 70° C. for 3 hours. After completion of the reaction, the resulting product was decomposed in a methanol solution of sodium hydroxide to remove the catalyst component, and then the residue was washed with methanol repeatedly and dried to obtain 580 g of a polymer.

The weight average molecular weight of said polymer as determined using 1,2,4-trichlorobenzene as a solvent at 130° C. by the gel permeation chromatography was 592,000. Weight average melecular weight/number average molecular weight was 2.81. The melting point and ¹³ C-NMR measurements confirmed that said polymer was polystyrene having a syndiotactic configuration.

PRODUCTION EXAMPLE 4

With 100 parts by weight of poly(2,6-dimethyl-1,4-phenylene) ether (PPO)(catalogue No. 18178-1, produced by Aldorich Co.), 5 parts by weight of maleic anhydride (S Grade, produced by Wako Junyaku Co.) and 0.2 parts by weight of t-butylhydroxy peroxide (trade name: Perbutyl H, produced by Nippon Oil & Fats Co., Ltd.) as a peroxide were mixed by a Henschel mixer, and then the resulting mixture was kneaded by the twin-screw extruder at 300° to 320° C. under heat melting to obtain maleic anhydride-modified PPO. The resulting modified PPO was dissolved in toluene, and then the resulting mixture was reprecipitated dropwise with methanol to be purified. The purified modified PPO was molded by compression. The peak due to a carbonyl group was observed by an infrared ray measurement to confirm that the PPO was modified by maleic anhydride.

PRODUCTION EXAMPLE 5

With 100 parts by weight of styrene grafted polyphenylene ether (PPE)(trade name: Iupiace CPX 100, produced by Mitsubishi Gas Chemical Company Inc.) having an intrinsic viscosity of 0.45° at 25° C. in chloroform, 0.5 parts by weight of maleic anhydride (S Grade, produced by Wako Junyaku Co.) and 0.4 parts by weight of cumenehydro peroxide (trade name; Percumyl produced by Nippon Oil & Fats Co., Ltd.) as a peroxide were mixed by a Henschel mixer, and then the resulting mixture was kneaded by the twin-screw extruder at 300° C. under heat melting to obtain maleic anhydride-modified PPE. It was confirmed that the resulting modified PPE was modified by maleic anhydride in the same manner as in Production Example 4.

PRODUCTION EXAMPLE 6

With 85 parts by weight of poly(2,6-dimethyl-1,4-phenylene) ether (PPO)(catalogue No. 18178-1, produced by Aldorich Co.), 15 parts by weight of SPS obtained in Production Example 1, 0.5 parts by weight of maleic anhydride (S Grade, produced by Wako Junyaku Co.) and 0.2 parts by weight of t-butylhydroxy peroxide (trade name: Perbutyl H, produced by Nippon Oil & Fats Co., Ltd.) as a peroxide were mixed by a Henschel mixer, and then the resulting mixture was kneaded by the twin-screw extruder at 300° to 320° C. under heat melting to obtain maleic anhydride-modified PPO. It was confirmed that the resulting modified PPO was modified by maleic anhydride in the same manner as in Production Example 4.

PRODUCTION EXAMPLE 7

With 85 parts by weight of poly(2,6-dimethyl-1,4 phenylene) ether (PPO)(catalogue No. 18178-1, produced by Aldorich Co.), 15 parts by weight of Idemitsu Polystyrene HT-54 (HIPS), 5 parts by weight of maleic anhydride (S Grade, produced by Wako Junyaku Co.) and 0.2 parts by weight of t-butylhydroxy peroxide (trade name: Perbutyl H, produced by Nippon Oil & Fats Co., Ltd.) as a peroxide were mixed by a Henschel mixer, and then the resulting mixture was kneaded by the twin-screw extruder at 260° to 270° C. under heat melting to obtain maleic anhydride-modified PPO. It was confirmed that the resulting modified PPO was modified by maleic anhydride in the same manner as in Production Example 4.

EXAMPLE 4

To 100 parts by weight of the total amount of 75% by weight of polystyrene having a syndiotactic configuration (SPS) obtained in Production Example 1 and 25% by weight of maleic anhydride-modified PPO obtained in Production Example 4, 0.7 parts by weight of (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite (trade name: PEP-36, produced by Adeka Argus Co., Ltd.), 0.1 parts by weight of 2,6-di-t-butyl-4-phenol (trade name: Sumilizer BHT, produced by Sumitomo Chemical Co., Ltd.) and 1 part by weight of p-(t-butyl)benzoic acid as an antioxidant were added. The resulting mixture was dry blended by a Henschel mixer, and then kneaded under melting by a twin-screw extruder having a cylinder temperature of 300° C. to be pelletized.

The resulting pellet was molded by injection to obtain test pieces for a bending test. The bending test was carried out. The results are shown in Table 1.

COMPARATIVE EXAMPLE 1

To 100 parts by weight of polystyrene having a syndiotactic configuration (SPS) obtained in Production Example 1, 0.7 parts by weight of (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite (trade name: PEP-36, produced by Adeka Argus Co., ltd.), 0.1 parts by weight of 2,6-di-t-butyl-4-phenol (trade name: Sumilizer BHT, produced by Sumitomo Chemical Co , Ltd.) and 1 part by weight of p-(t-butyl)benzoic acid as an antioxidant were added. The resulting mixture was dry blended by a Henschel mixer, and then kneaded under melting by a twin-screw extruder cylinder temperature of 300° C. to be pelletized.

The resulting pellet was molded by injection to obtain test pieces for a bending test. The bending test was carried out. The results are shown in Table 1.

                  TABLE 1                                                          ______________________________________                                                          Bending  Modulus of                                                            Strength Bending Elasticity                                   No.              (kg/cm.sup.2)                                                                           (kg/cm.sup.2)                                        ______________________________________                                         Example 1        1300     49000                                                Comparative Example 1                                                                           1000     39000                                                ______________________________________                                    

EXAMPLE 2

To 100 parts by weight of the total amount of 95% by weight of polystyrene having a syndiotactic configuration (SPS) obtained in Production Example 1 and 5% by weight of modified PPO obtained in Production Example 4, 0.7 parts by weight of (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite (trade name: PEP-36. produced by Adeka Arugus Co., Ltd.), 0.1 parts by weight of 2,6-di-t-butyl-4-phenol (trade name: Sumilizer BHT, produced by Sumitomo Chemical Co., Ltd.) and 1 part by weight of p-(t-butyl)aluminum benzoate (trade name: PTBBA-Al, produced by Dainippon Ink Industry Co.) as an antioxidant were added. The resulting mixture was dry blended by a Henschel mixer, and then pelletized by a twin-screw extruder while side-feeding 43 parts by weight of glass fiber treated with amino silane (03T-488, 13 μm/3 mm, produced by Nippon Electric Glass Co., Ltd.) as a filler. The resulting pellet was molded by injection to obtain a bending test piece and an Izod impact test piece. Using the resulting test pieces, the bending test and Izod impact test were carried out. The heat distortion temperature was determined. The results are shown in Table 3.

EXAMPLES 3 TO 23 AND COMPARATIVE EXAMPLES 2 TO 6

The procedure of Example 2 was repeated except that SPS obtained in the above Production Examples 1 to 3, atactic polystyrene (trade name: Idemitsu Polystyrene HH30E, produced by Idemitsu Petrochemical Co., Ltd.) or high impact polystyrene (trade name: Idemitsu Polystyrene HT-54, produced by Idemitsu Petrochemical Co., Ltd.) was used as a styrene polymer, and the product obtained in the above Production Examples 4 to 7 or poly(2,6-dimethyl-1,4-phenylene)ether (catalogue No. 18178-1, produced by Aldorich Co.) was used as polyphenylene ether, and further a filler and an additive were added according to the prescription shown in Table 2. These results are shown in Table 3.

However, in Example 12, with 100 parts by weight of the total amount of 95% by weight or syndiotactic polystyrene (SPS) obtained in the above Production Example 1 and 5% by weight of poly(2,6-dimethyl-1,4-phenylene)ether (catalogue No. 18178-1, produced by Aldorich Co.), 0.5 parts by weight of maleic anhydride (S Grade, produced by Hiroshima Wako Junyaku Co.) and 0.2 parts by weight of t-butyl-hydroxy peroxide (trade name: Perbutyl H, produced by Nippon Oil & Fats Co., Ltd.) as a peroxide were dry blended by a Henschel mixer, and then the resulting mixture was pelletized by a twin-screw extruder while side-feeding 43 parts by weight of glass fiber treated with amino silane (03T-488, 13 μm/3 mm, produced by Nippon Electric Glass Co., Ltd.) as a filler.

                                      TABLE 2                                      __________________________________________________________________________                                            Filler                                          Base Composition (100 Parts)             Part by                                                                            Granular                                                                            Part by              No.     Component (A)                                                                             wt %                                                                               Component (B)                                                                              wt %                                                                               Fibrous Filler                                                                           Weight                                                                             Filler                                                                              Weight               __________________________________________________________________________     Example 2                                                                              Product of 95  Product of  5   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 4                                    Example 3                                                                              Product of 97  Product of  3   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 4                                    Example 4                                                                              Product of 90  Product of  10  Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 4                                    Example 5                                                                              Product of 70  Product of  30  Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 4                                    Comparative                                                                            Product of 100 --          --  Chopped Strand*.sup.1                                                                    43  --   --                   Example 2                                                                              Production Example 1                                                   Comparative                                                                            Product of 70  PPO*.sup.2  30  Chopped Strand*.sup.1                                                                    43  --   --                   Example 3                                                                              Production Example 1                                                   Example 6                                                                              Product of 90  Product of  10  Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 5                                    Example 7                                                                              Product of 90  Product of  10  Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 6                                    Example 8                                                                              Product of 92.5                                                                               Product of  7.5 Chopped Strand*.sup.1                                                                    65  --   --                           Production Example 2                                                                          Production Example 4                                    Example 9                                                                              Product of 92.5                                                                               Product of  7.5 Chopped Strand*.sup.1                                                                    100 --   --                           Production Example 3                                                                          Production Example 4                                    Example 10                                                                             Product of 92.5                                                                               Product of  7.5 Chopped Strand*.sup.1                                                                    115 Talc*.sup.6                                                                         70                           Production Example 1                                                                          Production Example 4                                    Example 11                                                                             Product of 40  Product of  60  Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 4                                    Example 12                                                                             Product of 95  *.sup.7     5   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                   Example 13                                                                             aPS*.sup.8 95  Product of  5   Chopped Strand*.sup.1                                                                    43  --   --                                          Production Example 4                                    Example 14                                                                             HIPS*.sup.9                                                                               95  Product of  5   Chopped Strand*.sup.1                                                                    43  --   --                                          Production Example 4                                    Example 15                                                                             Product of 95  Product of  5   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 7                                    Comparative                                                                            Product of 15  Product of  85  Chopped Strand*.sup.1                                                                    43  --   --                   Example 4                                                                              Production Example 1                                                                          Production Example 7                                    Comparative                                                                            Product of 97  PPO*.sup.2  3   Chopped Strand*.sup.1                                                                    43  --   --                   Example 5                                                                              Production Example 1                                                   Example 16                                                                             Product of 95  Product of  5   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 8                                    Example 17                                                                             Product of 99  Product of  1   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 9                                    Example 18                                                                             Product of 97  Product of  3   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 9                                    Example 19                                                                             Product of 90  Product of  10  Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 9                                    Example 20                                                                             Product of 97  Product of  3   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 10                                   Example 21                                                                             Product of 95  Product of  5   Chopped Strand*.sup.1                                                                    43  --   --                           Production Example 1                                                                          Production Example 11                                   Comparative                                                                            Product of 90  Product of  10  Chopped Strand*.sup.1                                                                    43  --   --                   Example 6                                                                              Production Example 1                                                                          Production Example 12                                   Example 22                                                                             Product of 97  Product of  3   Chopped Strand*.sup.10                                                                   30  --   --                           Production Example 1                                                                          Production Example 4                                    Example 23                                                                             Product of 97  Product of  3   Chopped Strand*.sup.10                                                                   40  --   --                           Production Example 1                                                                          Production Example 4                                    __________________________________________________________________________                            Rubber-like                                                                    Elastomer                                                                             Antioxidant                                                                              Antioxidant  Nuclear Agent                                       Part by                                                                            Antioxidant                                                                          Part by                                                                            Antioxidant                                                                             Part by   Part by                             No.    Kind                                                                              Weight                                                                             (1)   Weight                                                                             (2)      Weight                                                                             Kind  Weight              __________________________________________________________________________                     Example 2                                                                             -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 3                                                                             -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 4                                                                             -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 5                                                                             -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Comparative                                                                           -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 2                                                                      Comparative                                                                           -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 3                                                                      Example 6                                                                             -- --  PEP-36                                                                               0.5 MARK AO 60*.sup.3                                                                       0.1 PTBBA-A1                                                                             0.5                                 Example 7                                                                             -- --  P-EPQ*.sup.4                                                                         0.2 MARK AO 60*.sup.3                                                                       0.1 PTBBA-A1                                                                             0.2                                 Example 8                                                                             SB*.sup.5                                                                         10  P-EPQ*.sup.4                                                                         0.5 MARK AO 60*.sup.3                                                                       0.1 PTBBA-A1                                                                             0.5                                 Example 9                                                                             -- --  PEP-36                                                                               0.5 MARK AO 60*.sup.3                                                                       0.1 PTBBA-A1                                                                             0.5                                 Example 10                                                                            -- --  PEP-36                                                                               0.5 MARK AO 60*.sup.3                                                                       0.1 PTBBA-A1                                                                             0.5                                 Example 11                                                                            -- --  PEP-36                                                                               0.5 MARK AO 60*.sup.3                                                                       0.1 PTBBA-A1                                                                             0.5                                 Example 12                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             0.5                                 Example 13                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             0.5                                 Example 14                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             0.5                                 Example 15                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             0.5                                 Comparative                                                                           -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             0.5                                 Example 4                                                                      Comparative                                                                           -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 5                                                                      Example 16                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 17                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 18                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 19                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 20                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 21                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Comparative                                                                           -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 6                                                                      Example 22                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                                   Example 23                                                                            -- --  PEP-36                                                                               0.7 BHT      0.1 PTBBA-A1                                                                             1                   __________________________________________________________________________      *.sup.1 Chopped strand treated with aminosilane, 13 μm/3 mm, 03T488,        produced by Nippon Electric Glass Co., Ltd.                                    *.sup.2 Poly(2,6diemthyl-1,4 phenylene)ether                                   *.sup.3 Tetrakis[methylene3-(3',5di-t-butyl-4hydroxyphenyl)]propionate         (produced by Adeka Argus Co., Ltd.)                                            *.sup.4 Tetrakis(2,4di-t-butylphenyl)-4-4biphenylene phosphite (produced       by Ciba Geigy Co., Ltd.)                                                       *.sup.5 Styrenebutadiene rubber (ZLS01, produced by Nippon Zeon Co.)           *.sup.6 Talc treated by spraying a toluene/water suspension of aminopropy      triethoxysilane.                                                               *.sup.7 Refer to the description of Example 12.                                *.sup.8 Atactic polystyrene (trade name: Polystyrene HH30E, produced by        Idemitsu Petrochemical Co., Ltd.)                                              *.sup.9 High impact polystyrene (trade name: Polystyrene HT54, produced b      Idemitsu Petrochemical Co., Ltd.)                                              *.sup. 10 Chopped strand treated with aminosilane and isocyanate, 14           μm/3 mm, 03T051 produced by Nippon Electric Glass Co., Ltd.           

                  TABLE 3                                                          ______________________________________                                                             Izod Impact                                                                               Heat Distortion                                          Bending    Strength   Temperature                                              Strength   (notched)  (18.6 kg/cm.sup.2)                              No.      (kg/cm.sup.2)                                                                             (kg · cm/cm)                                                                     (°C.)                                    ______________________________________                                         Example 2                                                                               1750       8.2        251                                             Example 3                                                                               1650       7.6        252                                             Example 4                                                                               1830       8.5        250                                             Example 5                                                                               1860       8.7        220                                             Comparative                                                                             1200       4.6        250                                             Example 2                                                                      Comparative                                                                             1480       5.0        215                                             Example 3                                                                      Example 6                                                                               1760       8.1        250                                             Example 7                                                                               1780       8.3        251                                             Example 8                                                                               1980       7.5        254                                             Example 9                                                                               2150       8.0        260                                             Example 10                                                                              2000       7.6        265                                             Example 11                                                                              1850       8.8        190                                             Example 12                                                                              1760       8.4        250                                             Example 13                                                                              1740       8.0        --                                              Example 14                                                                              1650       8.1        --                                              Example 15                                                                              1790       8.3        252                                             Comparative                                                                             1750       8.2         .sup. 163*.sup.1                               Example 4                                                                      Comparative                                                                             1450       5.0        248                                             Example 5                                                                      Example 16                                                                              1610       6.7        252                                             Example 17                                                                              1780       7.6        255                                             Example 18                                                                              1810       8.8        254                                             Example 19                                                                              1840       8.7        243                                             Example 20                                                                              1770       8.5        250                                             Example 21                                                                              1760       8.2        250                                             Comparative                                                                             1400       4.9        250                                             Example 6                                                                      Example 22                                                                              1750       10.2       257                                             Example 23                                                                              2070       9.5        260                                             ______________________________________                                          *.sup.1 The resin of Comparative Example 4 was heat treated at 80°      C. Its dimensional stability was good.                                   

EXAMPLE 24

To 100 parts by weight of the total amount of 85% by weight of polystyrene having a syndiotactic configuration (SPS) obtained in Production Example 1, 5% by weight of maleic anhydride-modified PPO obtained in Production Example 4, and 10% by weight of nylon-6,6 (trade name: Ube Nylon 2020B, produced by Ube Kosan Co., Ltd.), 0.7 parts by weight of (2,6-di-t-butyl-4-methylphenyl)pentaerythritol diphosphite (trade name: PEP-36, produced by Adeka Argus Co., Ltd.), 0.1 parts by weight of 2,6-di-t-butyl-4-phenol (trade name: Sumilizer BHT, produced by Sumitomo Chemical Co., Ltd.) and 1 part by weight of p-(t-butyl)aluminum benzoate as an antioxidant were added. The resulting mixture was dry blended by a Henschel mixer, and then kneaded under melting by twin-screw extruder at a cylinder temperature of 300° C. to be pelletized.

The resulting pellet was molded by injection to obtain test pieces for a tensile test. The modulus of tensile elasticity, the water-absorptivity and the retention of the modulus of tensile elasticity after water-absorption were determined. The results are shown in Table 4.

EXAMPLES 25 TO 29 AND COMPARATIVE EXAMPLES 7 TO 9

The procedure of Example 24 was repeated except that a styrene polymer, polyphenylene ether, polyamide and an additive were blended in the proportion shown in Table 4. The modulus of tensile elasticity, the water-absorptivity and the retention of the modulus of tensile elasticity after water-absorption were determined The results are shown in Table 4. In Example 24 Comparative Example 9, the blending strength was determined.

EXAMPLE 30

To 100 parts by weight of the total amount of 85% by weight of polystyrene having a syndiotactic configuration (SPS) obtained in Production Example 1, 5% by weight of maleic anhydride-modified PPO obtained in Production Example 4, and 10% by weight of Nylon-6,6 (trade name: Ube Nylon 2020B, produced by Ube Kosan Co., Ltd.), 0.7 parts by weight of (2,6-di-t-butyl-4-methylphenyl)pentaerythritol diphosphite (trade name: PEP-36, produced by Adeka Argus Co., Ltd.), 0.1 parts by weight of tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)]propionate (trade name: MARK AO 60, produced by Adeka Argus Co., Ltd.) and 1 part by weight of p-(t-butyl)benzoic acid as an antioxidant were added. The resulting mixture was dry blended by a Henschel mixer, and then kneaded under melting by a twin-screw extruder at a cylinder temperature of 300° C. while side-feeding 43 parts by weight of glass fiber (trade name: CS03MA416, produced by Asahi Glass Fiber Co., Ltd.) treated with amino silane as a filler to be pelletized.

The resulting pellet was molded by injection to obtain test pieces for a tensile test and a bending test. The modulus of tensile elasticity, the water-absorptivity, the retention of the modulus of tensile elasticity after water-absorption and the heat distortion temperature were determined. The results are shown in Table 5.

In Example 34, 41, 42 and Comparative Example 10 the Izod impact strength was determined.

                                      TABLE 4                                      __________________________________________________________________________            Base Composition (100 parts)                                            No.    Component (A)                                                                             wt %                                                                               Component (B)                                                                             wt %                                                                               Component (C)                                                                          wt %                              __________________________________________________________________________     Example 24                                                                            Product of 85  Product of 5   Nylon-6,6                                                                              10                                       Production Example 1                                                                          Production Example 4                                     Example 25                                                                            Product of 85  Product of 5   Nylon-6*.sup.1                                                                         10                                       Production Example 1                                                                          Production Example 4                                     Comparative                                                                           Product of 90  --         0   Nylon-6,6                                                                              10                                Example 7                                                                             Production Example 1                                                    Comparative                                                                           --          0  --         0   Nylon-6,6                                                                              100                               Example 8                                                                      Example 26                                                                            Product of 45  Product of 10  Nylon-6,6                                                                              45                                       Production Example 2                                                                          Production Example 5                                     Comparative                                                                           Product of 50  --         0   Nylon-6,6                                                                              50                                Example 9                                                                             Production Example 2                                                    Example 27                                                                            Product of 15  Product of 20  Nylon-6,6                                                                              65                                       Production Example 2                                                                          Production Example 5                                     Example 28                                                                            Product of 15  Product of 10  Nylon-6,6                                                                              75                                       Production Example 2                                                                          Production Example 5                                     Example 29                                                                            Product of 40  Product of 5   Nylon-4,6*.sup.6                                                                       55                                       Production Example 2                                                                          Production Example 5                                     __________________________________________________________________________            Antioxidant               Nuclear Agent                                 No.    Kind Part by Weight                                                                         Kind Part by Weight                                                                         Kind   Part by Weight                         __________________________________________________________________________     Example 24                                                                            PEP-36                                                                              0.7     BHT  0.1     PTBBA-A1*.sup.3                                                                       1                                      Example 25                                                                            PEP-36                                                                              0.7     BHT  0.1     PTBBA-A1                                                                              1                                      Comparative                                                                           PEP-36                                                                              0.7     BHT  0.1     PTBBA-A1                                                                              1                                      Example 7                                                                      Comparative                                                                           PEP-36                                                                              0.7     BHT  0.1     PTBBA-A1                                                                              1                                      Example 8                                                                      Example 26                                                                            PEP-36                                                                              0.3     AO-60*.sup.2                                                                        0.1     PTBBA-A1                                                                              0.5                                    Comparative                                                                           PEP-36                                                                              0.3     AO-60                                                                               0.1     PTBBA-A1                                                                              0.5                                    Example 9                                                                      Example 27                                                                            PEP-36                                                                              0.3     AO-60                                                                               0.1     PTBBA-A1                                                                              0.5                                    Example 28                                                                            PEP-36                                                                              0.3     AO-60                                                                               0.1     PTBBA-A1                                                                              0.5                                    Example 29                                                                            PEP-36                                                                              0.3     AO-60                                                                               0.1     PTBBA-A1                                                                              0.5                                    __________________________________________________________________________                                      Change in Modulus of                                           Modulus of                                                                              Water*.sup.4                                                                          Tensile Elasticity                                                                        Bending                                             Tensile Elasticity                                                                      Absorptivity                                                                          by Absorption*.sup.5                                                                      Strength                                     No.    (kg/cm.sup.2)                                                                           (%)    (%)        (kg/cm.sup.2)                      __________________________________________________________________________               Example 24                                                                            49000    0.15   0          --                                           Example 25                                                                            47000    0.15   0          --                                           Comparative                                                                           36000    0.15   0          --                                           Example 7                                                                      Comparative                                                                           45000    1.30   -10.5      --                                           Example 8                                                                      Example 26                                                                            48000    0.20   0          1200                                         Comparative                                                                           41000    0.23   0           900                                         Example 9                                                                      Example 27                                                                            46000    0.52   -4.9       --                                           Example 28                                                                            44000    0.90   -8.5       --                                           Example 29                                                                            48000    0.32   -0.8       1500                               __________________________________________________________________________      *.sup.1 Ube Nylon 1013B, produced by Ube Kosan Co., Ltd.                       *.sup.2 Tetrakis[methylene3-(3',5',di-t-butyl-4hydroxyphenyl)]propionate       (produced by Adeka Argus Co., Ltd.)                                            *.sup.3 P(t-butyl)aluminum benzoate                                            ##STR3##                                                                       *.sup.5 Change in Modulus of Tensile Elasticity (%)                            =-                                                                             ##STR4##                                                                       *.sup.6 Unichika Nylon 46 (F5000), produced by Unichika Co., Ltd.        

                                      TABLE 5                                      __________________________________________________________________________                                                         Filler                             Base Composition (100 parts)                      Part by              No.     Component (A)                                                                             wt % Component (B)                                                                             wt %                                                                               Component (C)                                                                          wt % Kind  Weight               __________________________________________________________________________     Example 30                                                                             Product of 90   Product of  5  Nylon-6,6                                                                               5   Chopped*.sup.1                                                                       43                           Production Example 3                                                                           Production Example 6        Strand                     Example 31                                                                             Product of 80   Product of 10  Nylon-6,6                                                                              10   Chopped                                                                              43                           Production Example 3                                                                           Production Example 6        Strand                     Example 32                                                                             Product of 60   Product of 10  Nylon-6,6                                                                              30   Chopped                                                                              43                           Production Example 3                                                                           Production Example 6        Strand                     Example 33                                                                             Product of 25   Product of 10  Nylon-6,6                                                                              65   Chopped                                                                              43                           Production Example 3                                                                           Production Example 6        Strand                     Example 34                                                                             Product of 45   Product of 10  Nylon-6,6                                                                              45   Chopped                                                                              43                           Production Example 3                                                                           Production Example 6        Strand                     Comparative                                                                            Product of 50   --         --  Nylon-6,6                                                                              50   Chopped                                                                              43                   Example 10                                                                             Production Example 3                        Strand                     Example 35                                                                             Product of 65   Product of 20  Nylon-6,6                                                                              15   Chopped                                                                              43                           Production Example 3                                                                           Production Example 6        Strand                     Example 36                                                                             aPS*.sup.3 80   Product of 10  Nylon-6,6                                                                              10   Chopped                                                                              43                                           Production Example 6        Strand                     Example 37                                                                             HIPS*.sup.4                                                                               80   Product of 10  Nylon-6,6                                                                              10   Chopped                                                                              100                                          Production Example 6        Strand                     Example 38                                                                             Product of 80   Product of 10  Nylon-6,6                                                                              10   Chopped                                                                              115                          Production Example 1                                                                           Production Example 7        Strand                     Example 39                                                                             Product of 80   Product of 10  Nylon-6,6                                                                              10   Talc*.sup.5                                                                          70                           Production Example 1                                                                           Production Example 7                                   Example 40                                                                             Product of 80   Product of 10  Nylon-6 10   Chopped                                                                              43                           Production Example 1                                                                           Production Example 7        Strand                     Example 41                                                                             Product of 47   Product of  5  Nylon-6,6                                                                              48   Chopped                                                                              43                           Production Example 1                                                                           Production Example 7        Strand*.sup.7              Example 42                                                                             Product of 40   Product of  5  Nylon-4,6                                                                              55   Chopped                                                                              43                           Production Example 2                                                                           Production Example 5        Strand*.sup.7              __________________________________________________________________________              Rubber-like                                                                    Elastomer   Antioxidant                Nuclear Agent                                 Part by       Part by      Part by        Part by               No.      Kind  Weight                                                                               Kind    Weight                                                                               Kind   Weight                                                                               Kind     Weight                __________________________________________________________________________     Example 30                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1*.sup.2                                                                         0.5                   Example 31                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 32                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 33                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 34                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Comparative                                                                             --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 10                                                                     Example 35                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 36                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 37                                                                              --    --    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 38                                                                              --    --    --      --    AO-60  0.1   PTBBA-A1 0.5                   Example 39                                                                              --    --    PEP-36  0.2   AO-60  0.1   --       --                    Example 40                                                                              SB*.sup.6                                                                            10    PEP-36  0.2   AO-60  0.1   PTBBA-A1 0.5                   Example 41                                                                              --    --    PEP-36  0.1   AO-60  0.1   PTBBA-A1 1.0                   Example 42                                                                              --    --    PEP-36  0.1   AO-60  0.1   PTBBA-A1 1.0                   __________________________________________________________________________                                  Change in Modulus of                                                                        Heat Distortion                               Modulus of Tensile  Tensile Elasticity by                                                                       Temperature                                                                            Izod Impact Strength                  Elasticity                                                                               Water Absorptivity                                                                       Absorption   (18.6 kg/cm.sup.2)                                                                     (notched)                    No.      (kg/cm.sup.2)                                                                            (%)       (%)          (°C.)                                                                           (kg · cm/cm)        __________________________________________________________________________     Example 30                                                                              93000     0.15      0            250     --                           Example 31                                                                              92500     0.14      0            250     --                           Example 32                                                                              89000     0.21      0            250     --                           Example 33                                                                              82000     0.51      -5           250     --                           Example 34                                                                              84000     0.18      0            250     10.0                         Comparative                                                                             80000     0.19      0            245      5.1                         Example 10                                                                     Example 35                                                                              88000     0.17      0            242     --                           Example 36                                                                              91000     0.16      0            --      --                           Example 37                                                                              86000     0.16      0            --      --                           Example 38                                                                              114000    0.21      0            260     --                           Example 39                                                                              125000    0.24      0            265     --                           Example 40                                                                              84000     0.16      0            243     --                           Example 41                                                                              103000    0.22      0            252     10.8                         Example 42                                                                              110000    0.24      -1           270     10.3                         __________________________________________________________________________      *.sup.1 Chopped strand glass fiber treated with amino silane, 13 μm/3       mm.                                                                            *.sup.2 p-(t-butyl)aluminum benzoate                                           *.sup.3 Atactic polystyrene (trade name: Polystyrene HH30E, produced by        Idemitsu Petrochemical Co., Ltd.)                                              *.sup.4 High impact polystyrene (trade name: Polystyrene HT54, produced b      Idemitsu Petrochemical Co., ltd.)                                              *.sup.5 Styrene-butadiene rubber (ZLS01, produced by Nippon Zeon Co.)          *.sup.6 Talc treated by spraying a toluene/water suspension of                 γ-aminopropyl triethoxysilane.                                           *.sup.7 Chopped strand treated with aminosilane and isocyanate, 14 μm/      mm, 03T051 produced by Nippon Electric Glass Co., Ltd.                    

What is claimed is:
 1. A styrene polymer composition comprising(A) 99 to 1% by weight of a styrene polymer having a syndiotactic configuration, (B) 0.1 to 50% by weight of either of polyphenylene ether having a polar group or a mixture of polyphenylene ether having a polar group and a styrene polymer having no functional group, and (C) 0.9 to 98.9% by weight of polyamide.
 2. A styrene polymer composition according to claim 1, wherein the polar group in Component (B) is an acid derivative.
 3. A styrene polymer composition comprising 100 parts by weight of a styrene polymer composition according to any one of claims 1 or 2, and(D) 1 to 350 parts by weight of a filler surface-treated with a coupling agent.
 4. A styrene polymer composition according to claim 3, wherein the coupling agent used for surface treatment of the filler as Component (D) is a silane coupling agent.
 5. A styrene polymer composition comprising(A') 99 to 1% by weight of a styrene polymer having a syndiotactic configuration, (B') 0.1 to 50% by weight of either of polyphenylene ether having anhydrous maleic acid group or a mixture of polyphenylene ether having maleic acid anhydride group and a styrene polymer having no functional group, (C) 0.9 to 98.9% by weight of polyamide, and (D') a filler surface-treated with aminosilane coupling agent in the proportion of 1 to 350 parts by weight based on the total of above-mentioned Components (A'), (B'), and (C'). 